No first hand knowledge, but since you have the gun in hand, I'll pass along some wisdom I got from a gun trading buddy of mine. To wit, "When you get a new used gun, take it to a good gunsmith and have it professionally cleaned (unless you feel competant to do it yourself). By profesionally, I mean completely dissassembled down to the last screw,then take it to the range and put 300 rds. through it without cleaning. If it keeps going bang, you have keeper." This makes sense to me.Just my .02 worth.
fightingquaker13